Description:
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Currently sniffs, that extend
"PHP_CodeSniffer_Standards_AbstractVariableSniff" class and
have non-empty "processMemberVar" method use both "member
variable" and "variable" terms in error messages.
I think this is confusing and in case, when error is reported for
public class member variable we should write exactly "Public
member variable" instead of just "variable". Without this it's hard
to distinguish (just from error message) if an error is in class
variable or just in a regular variable.